气体: gas (i.e. gaseous substance)...
入学: to enter a school or college, to go to school for the first time as a child...
适量: appropriate amount...
温习: to review (a lesson etc)...
不耐烦: impatient, to lose patience...
吹牛: to talk big, to shoot off one's mouth, to chat (dialect)...
听到: to hear...
雇佣: to employ, to hire...
高空: high altitude...
